## Assertion Reason Questions of Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter PDF Download

Free PDF Download of CBSE Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Assertion Reason Questions for Class 12 Physics. Assertion and Reason Question for Class 12 Physics with Answers were Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Physics Dual Nature of Radiation and Matter to know their preparation level.

# Dual Nature of Radiation and Matter Class 12 Assertion Reason Questions

The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is also false.

Assertion (A) : Photoelectric effect demonstrates the wave nature of light.
Reason (R) : The number of photoelectrons is proportional to the frequency of light

(d) A is false and R is also false.

Assertion (A) : The de-Broglie wavelength of particle having kinetic energy K is l. If its kinetic energy becomes 4 K then its new wavelength would be l/2.

Reason (R) : The de-Broglie wavelength l is inversely proportional to square root of the kinetic energy

(a) Both A and R are true and R is the correct explanation of A.

Assertion (A) : There is a physical significance of matter waves.
Reason (R) : Both interference and diffraction occurs in it.

(a) Both A and R are true and R is the correct explanation of A. ​

Assertion (A) : A photon has no rest mass, yet it carries definite momentum.
Reason (R) : Momentum of photon is due to its energy and hence its equivalent mass

(a) Both A and R are true and R is the correct explanation of A. ​

Assertion (A) : Photosensitivity of a metal is high if its work function is small.
Reason (R) : Work function = hu0, where u0 is the threshold frequency

(b) Both A and R are true but R is not the correct explanation of A. ​

Assertion : The kinetic energy of photoelectrons emitted from metal surface does not depend on the intensity of incident photon.
Reason : The ejection of electrons from metallic surface is not possible with frequency of incident photons below the threshold frequency.

(b) Both A and R are true but R is not the correct explanation of A. ​​

Assertion : Two photons of equal wavelength must have equal linear momentum.
Reason : Two photons of equal linear momentum will have equal wavelength.

(d) A is false and R is also false.

Assertion : Two sources of equal intensity always emit equal number of photons in any time interval.
Reason : Two sources of equal intensity may emit equal number of photons in any time interval.

(d) A is false and R is also false.

Assertion : The photon behaves like a particle.
Reason : If E and P are the energy and momentum of the photon, then p = E / c .

(a) Both A and R are true and R is the correct explanation of A. ​

Assertion : In an experiment on photoelectric effect, a photon is incident on an electron from one direction and the photoelectron is emitted almost in the opposite direction. It violate the principle of conservation of linear momentum.
Reason : It does not violate the principle of conservation of linear momentum.

(d) A is false and R is also false.

Assertion : Photoelectric saturation current increases with the increase in frequency of incident light.
Reason : Energy of incident photons increases with increase in frequency and as a result photoelectric current increases.

(d) A is false and R is also false.

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